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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92973de2edf3e7246ae178ff8940193ae14de1c089f9b9162d8dd5abc950db66' 
  AND token = 'oTQPJeuSiar5B0QGsg+9XNos9Bz5pahUxkBiwKqXCbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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