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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4707c4774d467964f4c58b4dce0995f595d505666c07a21fe1e032faec88f964' 
  AND token = 'Uhl/nWN4/Q+kghICQw1dH9EXH5olVGCBC2BFIku03GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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