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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9910769ee16dcfc2c2ca6d8c1e965b82d8d004771b1244e02376e800e304bcea' 
  AND token = 'P6m9AA3bzoRCMKl8WknuoWTXLyY80JtwRLdk6I3GiT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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