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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e846dafcac8a314c5910df5ce4b8114dc0c6e5be4aa83495e45299f31003d3' 
  AND token = 'fnfr1PQT7BMhM15cBiPMa0lBz88Y88KI2DQJT3Kuxj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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