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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7593f97e93f264982b9521edf80a83bc8e6cf94eb2c88f7fab13776fe0f9dac9' 
  AND token = 'qN2U1USioQyASiawQYcFjHxIvdyFULjicaFYwfgkW3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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