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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531a024f49e9843c0f8519b4d2818d979ff694e7501349671a918a8f5fd2c712' 
  AND token = '4hBLXsp2+O2ddp+9pOIO9CC96uIuwS2tupLvWH9atTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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