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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462c1eb19c23bbe860f713c511a28cf21d44b9c18d22c97f2fdc559bafa52a15' 
  AND token = 'it8bOp+VGCsypayU6uEmUNtxItsaDwP0boXDFlI+FMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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