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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec96875708fc83381550f8e1cfb68c40e5fd4cb3de32e8cc003b15975e570ba' 
  AND token = 'f26A3tiPxPRTBvOPdq3uh5F7aZTS8qpHojw2z/IazEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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