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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019f4b36d448901c401d22190ae7b769cc02712bb5531d7a73616ddcef3b0181' 
  AND token = 'H1gs79yYMNyNEJm4Qaa8gWwnxlDttFFYEzav/MK4rDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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