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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c54c8e7afbea202e194d110a8d51abd3db9109f9c47fa2d0ac1ab241cca9c1' 
  AND token = 'C/OwAcsVq9oBZ3RH0AVtRkJkg/D9FEfajsHaukBnRjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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