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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b819364e3b768fb770140e495fe1de9330dafac7e799c24795c136747bc2e3' 
  AND token = 'KGf782V0yga6do4fhAS8hwG7M1yf+5svDoVXogaH8g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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