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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393ae798b8c5806ae48fc2ff4051be0b13dda215fc124482622f3d892b681b24' 
  AND token = 'Mt+PxWUsM2yatvtowavDPpDltmHJwiUeaP+ebjK1pGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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