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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88252524c12c31823efbd73b103c5dbfcdfc0ca43bf40596f23c3ad50ac714d8' 
  AND token = 'yELLa/Z4Fb4oz64hKwAMrfZGEXBWn8xReKpBor5Paqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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