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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d44da0bcb25122583a266b153c5cb88603d894975fd348c66b9332d63a9a88' 
  AND token = 'eoPV26MSIVT9h8YJMWpAZITHZAO5A4cDvJP9+upbz6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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