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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc7dc31b888524565b82606a3d05cc4e0857bf41ee322ae4402ce94b05f92aa' 
  AND token = 'kIRPvPBcu00lF1VN2DiOs6AORi1zEfaooBvMr4aPJC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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