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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ca94e5ceedcf8f30ef6d2348864155ec1181290682a0d18ce181005323451' 
  AND token = 'y85LcwmFH6K8+NdFsu/sh+Bga7q6BGnbYQOoPZonjMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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