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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171b179917823986abb962080ee8a29b7d990b73cd2d6cdfc9753c9fb6b1f04e' 
  AND token = 'OiHKXCx0LPOOLir5W1qB2dRnlLmjHHnyyjGaOneCup0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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