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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4884a2c4d509c40a58c0ecf48c344d5b3d1553e868913e6cdd838ee1fcd86b47' 
  AND token = 'vrRoMx0KfvevF0VNTvdu4q9u4jXmSoA0pEyqx3KfhHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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