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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60234dcdc74d2a9855885daadf0dc5f2e3146fbd08b209689c2e3c7da4092e93' 
  AND token = '2x1h0gCVnRaanDheR/Bd8aN67DM7mVLFKb9eyVOXJlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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