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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc58bf4c746448bd42a25561a49889c6873f691d7f83430cb1e574ace39f6fec' 
  AND token = 'DhpxSQEFGM9CAB0zlMkXwDLx16D4FrDUOFTw/BJSpPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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