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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2509e77fc6a2c321d96f072c8921f4e39cf4699ebbf4515b9cc3e516e815fc' 
  AND token = 'EuvHd71kJ47L23HBnsHJDtahPNBIp+Gp0tmRpgds4Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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