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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839dba1778bb795d64ef0b2bfe32a0bc8bb3ef9d23a231d6ff573ed651856920' 
  AND token = 'FzMJa1loE2xMJxl/psUyMCFRiAZlhA+o4x1zcuig8Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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