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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7647b46e2bde7cd4bcba4d99799f3a6c5a499cf49685d80344f91e62935b83b5' 
  AND token = 'cE5zl5E56+JyP5lnqcRLVn22+l4ruhcc7/TESYlz07Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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