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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc881a87904872e8d09a16cf846ad44e4787cdcabd3cd6e22cad83bdb7be6cd' 
  AND token = 'ImQaC7mwyOJCu2RqJemjozRBPTyMC8hJmJeOFR3RRjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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