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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc92cb1860b07d696973fce33d17c4638e18d07b8b8578847001ad3d4045bc3d' 
  AND token = 's7MQRJmFfKtaFFSd59vNukbLr4hWOrUc3UaYLDPFECY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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