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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c045fea87761e7a0cc3e3bb1a739a7e7dd3bbea6a7271f3f41433b3d70789886' 
  AND token = 'wvBD5caKaww4r+4ByrV7ycrebn+e/g0Yop3XlZCkbcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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