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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e850fd981a3f8986edbd0e151c4ca035e8dc14dde99f5986872c64a08b707e9' 
  AND token = 'yA/fRXWDD0tJISMA3va9jh5MVejhTlBWMUEPOAa73Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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