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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d1532ebb22a25bb646528f5d43fe6a53ed770318ecf9ba6c09fe49b85d1475' 
  AND token = 'j7Oeqfbc/MEgMooQHKwJdAweWrWHJCWDXZHlgtkoG0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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