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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7173800779a62d7b556e98f6da08049882be844197335d0d1ab8400041031122' 
  AND token = 'q8IXL3HdfTLd2NeHbdr1+H+XcYiBls6sALKfk8oo7lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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