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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea1337a1ef99883599c0972438cd06da47fc12899eddd59cddcc206f9f43c3a' 
  AND token = '/aFv7H4W4EkJODzEyaw5GiOQs+g9/R106Y3NTZKKjVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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