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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959e3f8f6bd44a7632f71ff326c01688869b0bac1ad1f51ca6cf9de76f200785' 
  AND token = 'MfZ/Tsg+AswcqXZRSysE/NLK+3bYOyjsX+iL1W3k0Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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