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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e599779a3c47c296e69f80f3e70278b9d2997d7e5baa3bc9d6c4c935b0d405bb' 
  AND token = 'ntaLLxsUkzPcj5QwGBF/rUmILqjXnFu7QU6XIiHnWQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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