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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4c11ca42364079d49a961948ca4fbcb5907e04562fdc6c8098f6bb7439fdd1' 
  AND token = 'I/QaAiPn8TL3UY205d4wB5es9XAONmkZP/bkyGZhPoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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