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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696d00e40dbae29c6d87cf287db9316bb8346d859b4ac9d0a87c1fbc787dde4e' 
  AND token = 'wvCGn0/Mrc2vFkCRNZqFqLDBCl5Fenzr/MA2mfF6+uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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