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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9cc5f454a39efa20ac11760d80a23b9e4e3322b6ab523849d5aecc38f08818' 
  AND token = 'XXRB0spyy+fWMW0O4zr4e7OE9H/fWBOYG9la8Hfr1Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}