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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f7ff1fb98667f757b21cfe1dbc1a21789f9e67aefe5d3b99d188b997264e8a' 
  AND token = 'j1q1xptihYpUAFU3a05lJPxFcLTynZWlGMLLfmt5zP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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