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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c23c0e1659e82914519de15efdab36448da6cb8b9bc23de9239836af3fd4510' 
  AND token = 'epoF2sE3L2Y3M+MA8gA3Dj2RKc+QAvecVUf/eWruxMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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