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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211555b11cc187907600da296c9fb8a7026440ea851f196a38e7de09192563c9' 
  AND token = '39t7LTqrLN0EBxpa+miRWThMgxjpt78bb/kPNam3GlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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