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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8dc1703e0e2a89d7f3c4f274563599c5d0e61882eeb521a581855b7a8ce933' 
  AND token = 'djx5Lecz62F1yf7B680K0vphBZEsD4vSIBRvhiSCkps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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