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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc77ed538ed4e596cd13843224805595480b2dd31809aa00f06a062cfd6b15e' 
  AND token = 'dYPHrUTgRU3NwC43Wf7KLieAfx90sbUwbRibZz2nWBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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