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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3d5c5787d5ac11a2b5b64a1bebc3fc449f90118bbbf3a47f894dfd217f4732' 
  AND token = 'YUnfrWJnz3dxgE1ql3jxj4GcU9HOS4ik6ht1AjvWw0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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