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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46641f8291e2b10e119f6efea667d02d8bcec8487c5e17d054fbfad3ba1de956' 
  AND token = 'XRiqcaqXDXIj2+8OPbQP6T+X2POLa1dfzQ2eXK5ETig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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