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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c6ad0c0f26c738beda45e4ca501229c1f2b5020702c18ee1b4f7fd8e144474' 
  AND token = 'I69Cr9TY5NNUlEgrsdcdqX34id8lchmioeace1Wv6H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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