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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff954bc0c8542c21cca28b0608c83bb31f81d5fa34238394489b167a7fa3332' 
  AND token = '0JIzG4LDfTwNvHjGAno81STVp8gnUday1nEiZCyq8Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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