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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9aa8e6b72728b3ff53434a5958cce4d2c9bf120c07c5ebfdf8cc3e2f80dc1a' 
  AND token = 'ZnqGYR+ea9Ep+k9500mnWzq0BQdMfsjzUE0AxQhB1Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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