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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adadb8c5a7523517c305e772b4375da57cdda75a607b9f08e0036dd1268606e' 
  AND token = 'ss5/jzYW7/OQdAcM9NFwaOPmbOeEmGH9CiymXltWxts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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