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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9f5341558df0a001ffe368d21ad2585ed236233d2a6aaf194ae3f6607afc2c' 
  AND token = 'kAJF/cf3yVdfDLappZTnDv3y1aCs0hrpPwuSs5B+Iho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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