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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc1d7c9726dc138e670f5f70838d7889a30ca3d3f2940092b582cc1473c5863' 
  AND token = 'QnOdZwAojZgpQKcmsBof3/rbY1b5Nui9j9tVih4/BAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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