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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a01942223716082ae8f55b2ce48747816b87eeb5c6b1c66a1ecfb69d6488880' 
  AND token = 'gVz+N+sgGC3ki75qk884t+W60zax4RXVCOsr7L4RS5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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