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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f07f06f5ae493ec0052382f373e318e286f8cb6761e3ec3f58da11a1f9015f' 
  AND token = 'N1d7g8xlImEnAWO0Wo8BfMiSOZfoHF3H2ywYjeCMGGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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