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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e287e2921636ba76c840f9fb6ae8348a9696ee095f90d35da8b8104849bc5ee' 
  AND token = 'cH0Z2acdEfxK/YhKq6wO+5b0R6r3sqmLVQ3oOnnE1TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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