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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05c12555bf5e52e8a80d4983b203627dc7ae0d97b5e764b3a746fc96b3cd6d4' 
  AND token = 'tTbA5Arf5Wc+QKBZ03+ou0Pq8ODKZZjXQgxp8FzEYf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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