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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1af9e491a69dcf6a0705ed603a9df22277a18e5235de184952a5dee4ecfe72a' 
  AND token = '7HHdAQm7hy7mHH9optlu681c5GNXWM8AYy4D74QHl+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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