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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd98c97b302215c84ccd272f4e11576aef41c20cabcb25c2b125f798788f53b' 
  AND token = 'es0+MnDuyvxgjK2bfZ/6mZtJ9niLpZeWI5HdNcbZsAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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