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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558c58edbb60ac04cb6bbedfe39058a9eb604a0fb46e07a13fcdb76c0da59024' 
  AND token = 's7qSEUic+Fx0B0uHegrGQO6mBoVDyMFWjKDgn5dE4Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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